ASTM D 3872 - 05 Standard Test Method for Ferrous Iron in Iron Oxides

American Society for Testing and Materials (ASTM). Current edition approved Sept. 1, 2005. Published September 2005. Originally approved in 1979. Last previous edition approved in 1999 as D 3872 – 86 (1999). 3 p. This test method covers the quantitative determination of ferrous oxide (FeO) by oxidation of ferrous iron (Fe++) in an acid solution to the ferric state (Fe+++) and titration with potassium dichromate using diphenylamine as the indicator.